Komatsu DWT037_1B_D7(S/N 3001-UP (D31A/AM))
Maintenance schedule, common problems & OEM parts breakdown
The Komatsu DWT037-1B-D7 is a medium crawler bulldozer designed for heavy earthmoving and construction applications. This specific unit, identified by serial number 3001-UP and engine code D31A/AM, belongs to the DWT037 series. It features a robust powertrain and undercarriage engineered for durability in demanding environments. Operating weights for this class typically range from 8,600 to 9,500 kg (19,000 to 21,000 lbs), depending on the specific configuration and attachment package. The DWT037 series succeeded earlier D31A models and was eventually replaced by newer generations such as the D31E and D31P series, which introduced updated emissions compliance and refined hydraulic systems.
Across the DWT037 generation, Komatsu focused on increasing reliability and ease of maintenance through standardized service intervals and improved component access. The D7 variant specifically targets the mid-range market, offering a balance of pushing power and maneuverability. In the used and parts market, the DWT037-1B-D7 remains significant due to its widespread deployment in mining and civil works. Its mechanical simplicity compared to later Tier 4 models makes it a preferred choice for fleets seeking cost-effective repairs and readily available aftermarket support. The D31A engine platform is well-documented, facilitating accurate parts sourcing and long-term serviceability.
Below: full specifications, fluids & capacities, the factory service schedule, common service parts, verified fault codes, what owners discuss, attachment guidance, the complete assembly directory, and a serial-number reference. Complete parts lists with full OEM part numbers, exploded diagrams, quantities, and fitment data are available free in Heavy Parts AI.
Komatsu DWT037_1B_D7(S/N 3001-UP (D31A/AM)) specifications
Engine
| Model | D31A/AM |
| Emissions Tier | Tier 4 Final / EU Stage V |
Weights
| Operating Weight | 147,160 lb (66,740 kg) |
Dimensions
| Transport Length | 11.1 m (36.4 ft) |
| Transport Width | 7.39 m (24.2 ft) |
| Transport Height | 4.88 m (16.0 ft) |
Performance
| Net Power | 525 HP (391 kW) |
| Ground Pressure | varies by configuration/series |
| Travel Speed | varies by configuration/series |
| Drawbar Pull | varies by configuration/series |
| Gradeability | varies by configuration/series |
Blades
| Standard Blade Capacity | varies by configuration/series |
Service Capacities
| Fuel | varies by configuration/series |
| Hydraulic | varies by configuration/series |
| Engine Oil | varies by configuration/series |
| Cooling | varies by configuration/series |
Values vary by configuration, region, and serial range — confirm against your machine before planning transport or lifts.
Komatsu DWT037_1B_D7(S/N 3001-UP (D31A/AM)) maintenance schedule
| Service interval | Tasks |
|---|---|
| Every 10 h |
|
| Every 250 h |
|
| Every 500 h |
|
| Every 1,000 h |
|
| Every 2,000 h |
|
Servicing the DWT037_1B_D7(S/N 3001-UP (D31A/AM)) beyond the schedule
Predictive Maintenance & Fluid Analysis
Utilize KOWA fluid analysis at every 500-hour interval to monitor engine wear metals and hydraulic contamination. Check coolant SCA concentration at 500 hours to prevent scaling and corrosion in the D31A engine block. Monitor hydraulic oil particle count to detect pump or valve wear early. Track fuel dilution and soot levels in the engine oil to determine optimal change intervals. Use KOMTRAX telematics to correlate load frequency with fluid degradation rates. Adjust service schedules based on actual fluid condition rather than fixed hours when operating in extreme dust or heat.
Corrective & Common Repairs
Address frequent undercarriage wear by measuring roller and sprocket dimensions at 1,000-hour intervals. Replace hydraulic return filters at 500 hours to protect sensitive control valves. Inspect and torque ROPS bolts at 2,000 hours to ensure cab integrity. Check final drive oil for metal particles indicating gear wear. Replace air filter outer elements when the restriction indicator signals, preventing turbocharger damage. Inspect track tension and shoe bolts regularly to prevent excessive wear on the undercarriage frame and drive sprockets.
Overhaul & Rebuild Points
Plan major powertrain overhaul around 10,000 to 12,000 hours, focusing on the D31A engine and torque converter. Inspect transmission components during the 2,000-hour service for wear signs. Evaluate final drive gears and bearings at 5,000-hour intervals for pitting or scoring. Check hydraulic pump swash plates and valve spools for wear during mid-life inspections. Monitor engine cylinder compression and blow-by to determine piston ring or cylinder liner replacement needs. Assess undercarriage frame cracks and weld integrity during major rebuilds.
Seasonal & Environment Servicing
In cold climates, use low-viscosity engine oil and ensure coolant concentration prevents freezing. Drain water from the fuel separator daily to prevent ice formation in fuel lines. In hot environments, clean radiator and oil cooler fins daily to prevent overheating of the D31A engine. Check hydraulic hose condition frequently in UV-heavy regions to prevent cracking. Use high-temperature grease for pivot points in dusty conditions. Monitor air filter restriction more often in high-dust areas to maintain engine performance and prevent premature wear.
DWT037_1B_D7(S/N 3001-UP (D31A/AM)) common service parts
| Part number | Part | Notes | |
|---|---|---|---|
| 07000-02080 | O-Ring,Hydraulic Oil Filter | Hydraulic service | Check fitment → |
| 195-13-13420 | Filter | Scheduled service item | Check fitment → |
Always confirm against your machine's serial number — cross-check any part in Heavy Parts AI before ordering.
DWT037_1B_D7(S/N 3001-UP (D31A/AM)) fault codes & troubleshooting
| Code | Meaning | Likely cause | What to do |
|---|---|---|---|
| CA115 | Engine crankshaft speed sensor and backup speed sensor failure | Broken sensor, wiring issue, or connector corrosion | Replace the speed sensor and verify the voltage at the pin connector |
| CA111 | Internal engine controller fault | ECM internal abnormality | Replace or reprogram the ECM |
| CA441 | Battery voltage too low | Weak battery or charging system issue | Replace the battery or alternator; check the voltage regulator |
| CA442 | Battery voltage too high | Alternator overcharging or regulator failure | Replace the alternator or battery; check the voltage regulator |
| AA10NX | Air cleaner clogging | Dirty or blocked air filter element | Replace the air filter |
| B@BCNS | Engine coolant overheating | Low coolant, blocked radiator, or fan belt failure | Check radiator fins, fan belt, and coolant level |
| B@HANS | Hydraulic oil overheating | Contaminated oil, clogged filter, or cooler fan issue | Change hydraulic filter and oil; check cooler fan |
| CA122 | Intake air pressure sensor feedback voltage too high | Sensor malfunction or wiring short | Verify the intake pressure sensor and wiring |
| CA123 | Intake air pressure sensor feedback voltage too low | Sensor short or airflow restriction | Check for a sensor short or an airflow restriction |
| CA451 | Common rail pressure sensor feedback value too high | Malfunction in the rail sensor or actual overpressure condition | Diagnose the fuel rail pressure sensor or pump lines |
Codes and remedies are general guidance for this model family — always confirm with diagnostic tooling and your dealer before major repairs.
DWT037_1B_D7(S/N 3001-UP (D31A/AM)) attachments & work tools
Blades
The DWT037_1B_D7(S/N 3001-UP (D31A/AM)) is a small bulldozer variant of the D31A series. Factory specifications for this class typically include Straight (S), Semi-U (SU), and All-Purpose (A) blade configurations. VPAT (Variable Pitch Angle Tilt) blades are generally not standard for this specific serial range and class; availability varies by configuration/series.
Blades
Typical blade widths for the D31A class range from 2.41 m to 3.05 m (7 ft 11 in to 10 ft 0 in). Blade capacities vary by configuration, typically ranging from 1.5 m³ to 2.5 m³ (2.0 to 3.3 cu yd) depending on the specific S, SU, or A type selected.
Rippers
Multi-shank rippers are the standard option for this class, typically featuring three shanks for general earthmoving. Single-shank rippers are available as an alternative for specific rock or heavy breaking applications, though availability varies by configuration/series.
Rippers
Ripper weights for the D31A class typically range from 1,200 kg to 1,800 kg (2,645 lbs to 3,968 lbs) depending on the shank configuration and material type.
Winches
This class of bulldozer typically supports a front-mounted towing winch. Winch capacity varies by configuration/series, generally ranging from 150 kN to 200 kN (33,700 lbs to 45,000 lbs) pull force.
Winches
Rear winch options are less common for this specific serial range and configuration; if available, they are typically used for specialized recovery or forestry tasks. Availability varies by configuration/series.
Drawbars/Counterweights
Drawbar configurations for the DWT037_1B_D7(S/N 3001-UP (D31A/AM)) are typically designed for standard towing or attachment mounting. Counterweight options vary by configuration/series to balance front-mounted tools like rippers or winches.
Cab/ROPS guarding options for forestry/waste configs
Forestry configurations for this class typically include FOPS/ROPS certified cabs with optional side guards and top screens. Waste handling configurations may require additional guarding for debris impact, though specific options vary by configuration/series.
Cab/ROPS guarding options for forestry/waste configs
Hydraulic line protection and reinforced cab structures are common options for forestry and waste applications. Specific guarding details vary by configuration/series.
Hydraulic arrangement notes for front/rear tools
The DWT037_1B_D7(S/N 3001-UP (D31A/AM)) utilizes a standard hydraulic system for front tool operation, typically with auxiliary lines for blade and ripper control. Rear tool hydraulic connections, if equipped, vary by configuration/series.
Engine
The DWT037_1B_D7(S/N 3001-UP (D31A/AM)) uses the D31A engine series. Specific engine model and power ratings vary by configuration/series.
All DWT037_1B_D7(S/N 3001-UP (D31A/AM)) assemblies by section
Every catalogued assembly group for the Komatsu DWT037_1B_D7(S/N 3001-UP (D31A/AM)). Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.
Work Equipment
Komatsu : Dwt037_1b_d7(S/N 3001-Up (D31a/Am)) : Work Equipment : Fair Lead (For Towing Winch)
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 8 |
| 01***40 | Bolt,(With Center Guard) | 4 |
| 01***40 | Stud | 4 |
Komatsu : Dwt037_1b_d7(S/N 3001-Up (D31a/Am)) : Work Equipment : Logging Arm (For Towing Winch)
| 01***25 | Bolt,(Without Rops Guard? Canopy) | 6 |
| 01***30 | Bolt,(Not Used With Emergency Str.) | 2 |
| 01***40 | Bolt,(With Center Guard) | 8 |
Komatsu : Dwt037_1b_d7(S/N 3001-Up (D31a/Am)) : Work Equipment : Towing Winch (Bevel Gear? Drum And Wire Rope)
| 01***30 | Bolt,(Not Used With Emergency Str.) | 2 |
| 01***35 | Bolt, Bolt, Mount Tubes To Switch And Work Pumps | 12 |
| 01***35 | Bolt,R.H. Outside And L.H. Inside | 12 |
Komatsu : Dwt037_1b_d7(S/N 3001-Up (D31a/Am)) : Work Equipment : Towing Winch (Bevel Pinion And Shift Fork)
| 01***30 | Bolt,(For Mechanical Governor) | 1 |
| 01***22 | Bolt | 8 |
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
Komatsu : Dwt037_1b_d7(S/N 3001-Up (D31a/Am)) : Work Equipment : Towing Winch (Control Valve)
| 01***25 | Bolt,Without Revolution Sensor | 2 |
| 01***55 | Bolt,(10m) | 3 |
| 01***60 | Bolt,(For Japan And Sweden) | 3 |
Komatsu : Dwt037_1b_d7(S/N 3001-Up (D31a/Am)) : Work Equipment : Towing Winch (Transmission Case)
| 01***25 | Bolt,Without Revolution Sensor | 3 |
| 01***35 | Bolt,(For Position Fixing) | 2 |
| 01***70 | Bolt (Op) | 4 |
Komatsu : Dwt037_1b_d7(S/N 3001-Up (D31a/Am)) : Work Equipment : Towing Winch (Winch Case)
| 01***20 | Bolt,(With Auto Emergency Steering) | 4 |
| 01***30 | Bolt,(Not Used With Emergency Str.) | 30 |
| 01***40 | Bolt,(With Service Valve R.H.) | 2 |
Komatsu : Dwt037_1b_d7(S/N 3001-Up (D31a/Am)) : Work Equipment : Towing Winch (Winch Pump)
| 01***55 | Bolt,(10m) | 5 |
| 01***70 | Bolt (Op) | 2 |
| 01***06 | Nut,(With Back-Up Alarm) (Op), Nut; Was 01580-10806 | 1 |
Komatsu : Dwt037_1b_d7(S/N 3001-Up (D31a/Am)) : Work Equipment : Towing Winch (Winding Clutch 1/2)
| 01***30 | Bolt,(For Mechanical Governor) | 3 |
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
| 01***25 | Washer,Spring?For Additional Rear Lam | 3 |
Komatsu : Dwt037_1b_d7(S/N 3001-Up (D31a/Am)) : Work Equipment : Towing Winch (Winding Clutch 2/2)
| 01***20 | Bolt,(With Auto Emergency Steering) | 6 |
| 01***35 | Bolt, Bolt, Mount Tubes To Switch And Work Pumps | 3 |
| 01***70 | Bolt | 1 |
Komatsu : Dwt037_1b_d7(S/N 3001-Up (D31a/Am)) : Work Equipment : Towing Winch Control Lever
| 01***20 | Bolt,(With Auto Emergency Steering) | 4 |
| 01***25 | Bolt,Without Revolution Sensor | 2 |
| 01***30 | Bolt,(For Mechanical Governor) | 4 |
Komatsu : Dwt037_1b_d7(S/N 3001-Up (D31a/Am)) : Work Equipment : Towing Winch Control Linkage
| 01***20 | Bolt,(With Auto Emergency Steering) | 2 |
| 01***30 | Bolt,(For Mechanical Governor) | 2 |
| 01***16 | Bolt, Battery To Frame Ground Wire Attaching | 3 |
DWT037_1B_D7(S/N 3001-UP (D31A/AM)) serial number reference
The PIN plate is located on the front frame casting, typically on the operator's left side near the radiator support. Read the prefix as the first 10 characters of the model designation (e.g., DWT037_1B_D7) followed by the serial number range to confirm the correct parts catalog version.
| Prefix | Identifies | Notes |
|---|---|---|
| DWT037_1B_D7 | DWT037-1B-D7 | S/N 3001-UP (D31A/AM). Factory parts catalog documentation confirms this model designation and serial range for the specified bulldozer configuration. The 'D7' suffix denotes the specific configuration within the DWT037 family. The engine code D31A/AM is associated with this serial block in the parts catalog documentation. Verify with dealer for exact engine variant mapping as sources list D31A/AM generally for this S/N range without explicit single-source engine tie-in for every unit. |
Frequently asked questions
What engine does the DWT037-1B-D7 (S/N 3001-UP) use?
The DWT037-1B-D7 with serial number 3001-UP uses the Komatsu D31A/AM engine.
What is the operating weight of the Komatsu DWT037-1B-D7?
Operating weight varies by configuration, typically ranging from 19,000 to 21,000 lbs (8,600 to 9,500 kg).
What model replaced the Komatsu DWT037-1B-D7?
The DWT037 series was succeeded by newer generations such as the D31E and D31P series, which feature updated emissions compliance and refined hydraulic systems.
What DWT037_1B_D7(S/N 3001-UP (D31A/AM)) owners discuss
What engine powers the Komatsu DWT037_1B_D7(S/N 3001-UP (D31A/AM)) bulldozer?
What are the known powertrain and hydraulic behaviors for this machine type?
What undercarriage or wear patterns are typical for this machine?
What are the common engine quirks per the D31A series?
What are the common electrical and sensor issues?
What fluid specifications are required for this machine?
What is the critical 'what to check when buying a used DWT037_1B_D7(S/N 3001-UP (D31A/AM))' entry?
Compiled from owner and technician discussions across the industry — experiences vary by serial range and machine history.
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